/* CSS Variables for Theme Support */
:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --border-color: #dee2e6;
    --accent-primary: #0066cc;
    --accent-secondary: #6c757d;
    --success-color: #28a745;
    --error-color: #dc3545;
    --warning-color: #ffc107;
    --shadow: rgba(0, 0, 0, 0.1);
    --gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);

    /* Color palette */
    --primary-color: #632ca6;
    --primary-hover: #5a2595;
    --secondary-color: #e0e7ff;
    --accent-color: #f59e0b;
    --text-color: #1f2937;
    --background-color: #ffffff;
    --surface-color: #f9fafb;
    --shadow-color: rgba(0, 0, 0, 0.1);

    /* Status colors */
    --success-bg: #ecfdf5;
    --error-bg: #fef2f2;
    --warning-bg: #fffbeb;
    --info-bg: #eff6ff;

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;

    /* Border radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
}

[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #404040;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --border-color: #404040;
    --accent-primary: #4da6ff;
    --accent-secondary: #8a8a8a;
    --success-color: #4caf50;
    --error-color: #f44336;
    --warning-color: #ff9800;
    --shadow: rgba(0, 0, 0, 0.3);
    --gradient: linear-gradient(135deg, #4a5568 0%, #2d3748 100%);

    --text-color: #f9fafb;
    --background-color: #111827;
    --surface-color: #1f2937;
    --surface-color-dark: #374151;
    --border-color: #374151;
    --border-color-dark: #4b5563;
    --shadow-color: rgba(0, 0, 0, 0.25);

    /* Status colors for dark theme */
    --success-bg: #064e3b;
    --error-bg: #7f1d1d;
    --warning-bg: #78350f;
    --info-bg: #1e3a8a;
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
header {
    background: var(--gradient);
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 2rem;
    color: white;
    position: relative;
    overflow: hidden;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
    z-index: 2;
    gap: 1rem;
}

.header-left,
.header-right {
    flex: 0 0 auto;
    display: flex;
    align-items: center;
}

.header-center {
    flex: 1;
    text-align: center;
}

.header-content h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.header-content p {
    font-size: 1.2rem;
    opacity: 0.9;
}

.github-link {
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 50px;
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.3);
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    gap: 0.5rem;
    font-size: 0.9rem;
    font-weight: 500;
    margin-right: 0.75rem;
}

.github-link:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-1px);
    color: white;
}

.github-link span {
    white-space: nowrap;
}

.theme-toggle {
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.3);
    color: white;
    padding: 0.75rem;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.2rem;
    transition: all 0.3s ease;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

/* Main Content */
main {
    flex: 1;
}

.app-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

/* Sections */
section {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 10px var(--shadow);
}

section h2 {
    margin-bottom: 1rem;
    color: var(--text-primary);
    font-size: 1.5rem;
    font-weight: 600;
}

/* Controls */
.input-controls,
.output-controls {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    padding: 0.625rem 1rem;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.2s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background: var(--accent-primary);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background: #0052a3;
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--border-color);
    transform: translateY(-1px);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

.file-input-label {
    cursor: pointer;
}

/* Drop Zone */
.drop-zone {
    position: relative;
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    transition: all 0.3s ease;
    background: var(--bg-primary);
}

.drop-zone.drag-over {
    border-color: var(--accent-primary);
    background: rgba(0, 102, 204, 0.05);
}

.drop-zone textarea {
    width: 100%;
    height: 400px;
    border: none;
    background: transparent;
    color: var(--text-primary);
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875rem;
    line-height: 1.5;
    padding: 1rem;
    resize: vertical;
    outline: none;
}

.drop-zone textarea::placeholder {
    color: var(--text-secondary);
}

/* Output Container */
.output-container {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
}

#hcl-output {
    margin: 0;
    padding: 1rem;
    background: transparent;
    color: var(--text-primary);
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875rem;
    line-height: 1.5;
    white-space: pre-wrap;
    word-wrap: break-word;
    max-height: 400px;
    overflow-y: auto;
    min-height: 100px;
}

/* Messages */
.error-message,
.success-message {
    margin-top: 0.75rem;
    padding: 0.75rem;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
}

.error-message {
    background: rgba(220, 53, 69, 0.1);
    color: var(--error-color);
    border: 1px solid rgba(220, 53, 69, 0.2);
}

.success-message {
    background: rgba(40, 167, 69, 0.1);
    color: var(--success-color);
    border: 1px solid rgba(40, 167, 69, 0.2);
}

.error-message:empty,
.success-message:empty {
    display: none;
}

/* Info Section */
.info-section {
    grid-column: 1 / -1;
}

.info-section details {
    margin-bottom: 1rem;
}

.info-section summary {
    cursor: pointer;
    padding: 0.75rem;
    background: var(--bg-tertiary);
    border-radius: 6px;
    font-weight: 500;
    list-style: none;
    user-select: none;
}

.info-section summary::-webkit-details-marker {
    display: none;
}

.info-section summary:before {
    content: "▶";
    margin-right: 0.5rem;
    transition: transform 0.2s ease;
}

.info-section details[open] summary:before {
    transform: rotate(90deg);
}

.info-section details[open] summary {
    margin-bottom: 0.75rem;
}

.info-section ol,
.info-section ul {
    padding-left: 1.5rem;
    margin-top: 0.75rem;
}

.info-section li {
    margin-bottom: 0.5rem;
}

.info-section code {
    background: var(--bg-tertiary);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.8rem;
}

/* Footer */
footer {
    margin-top: 2rem;
    padding: 1.5rem 0;
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-secondary);
}

footer a {
    color: var(--accent-primary);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    .app-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .header-content {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }

    .header-left,
    .header-right {
        order: 2;
    }

    .header-center {
        order: 1;
    }

    .header-content h1 {
        font-size: 2rem;
    }

    .input-controls,
    .output-controls {
        flex-direction: column;
    }

    .drop-zone textarea {
        height: 300px;
    }
}

@media (max-width: 480px) {
    .header-content h1 {
        font-size: 1.75rem;
    }

    .header-content p {
        font-size: 1rem;
    }

    .btn {
        padding: 0.75rem 1rem;
        justify-content: center;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus States */
button:focus,
textarea:focus,
summary:focus {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --shadow: rgba(0, 0, 0, 0.5);
    }

    [data-theme="dark"] {
        --border-color: #ffffff;
        --shadow: rgba(255, 255, 255, 0.3);
    }
}